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Credit Facilities, Long-Term Debt and Lease Liabilities - Amounts Outstanding (Details) $ in Millions, $ in Millions, $ in Millions | Dec. 31, 2020 CAD ($) | Dec. 31, 2020 USD ($) | Oct. 22, 2020 AUD ($) | Dec. 31, 2019 CAD ($) | Dec. 31, 2019 USD ($) | Aug. 02, 2018 CAD ($) | Jul. 20, 2018
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Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Carrying value | $ 3,361 |  |  | $ 3,212 |  |  |
Interest rate |  |  | 4.07% |  |  |  | 4.509%
Less: current portion of long-term debt | (97) |  |  | (494) |  |  |
Less: current portion of lease liabilities | (8) |  |  | (19) |  |  |
Total current long-term debt and lease liabilities | (105) |  |  | (513) |  |  |
Credit facilities, long-term debt, and finance lease obligations | 3,256 |  |  | 2,699 |  |  |
All Borrowings Except Finance Lease Obligations |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Carrying value | 3,227 |  |  | 3,070 |  |  |
Notional amount | 3,264 |  |  | 3,104 |  |  |
Credit facilities |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Carrying value | 114 |  |  | 220 |  |  |
Notional amount | 114 |  |  | 220 |  |  |
Debentures |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Carrying value | 249 |  |  | 647 |  | $ 400 |
Notional amount | 251 |  |  | 651 |  |  |
Interest rate |  |  |  |  |  | 6.40% | 6.40%
Senior notes |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Carrying value | 886 |  |  | 905 |  |  |
Notional amount | 894 |  |  | 914 |  |  |
Senior notes | U.S. Dollars |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Notional amount |  | $ 700 |  |  | $ 700 |  |
Non-recourse |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Carrying value | 1,837 |  |  | 1,144 |  |  |
Notional amount | 1,858 |  |  | 1,157 |  |  |
Other |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Carrying value | 141 |  |  | 154 |  |  |
Notional amount | 147 |  |  | 162 |  |  |
Other | U.S. Dollars |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Notional amount |  | $ 110 |  |  | $ 117 |  |
Finance lease obligation |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Carrying value | $ 134 |  |  | $ 142 |  |  |
Senior Secured Note Maturing June 2042 |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Carrying value |  |  | $ 800 |  |  |  |
Interest rate |  |  | 4.07% |  |  |  |
Weighted average | Credit facilities |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Interest rate | 2.70% | 2.70% |  | 3.50% | 3.50% |  |
Weighted average | Debentures |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Interest rate | 7.10% | 7.10% |  | 5.80% | 5.80% |  |
Weighted average | Senior notes |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Interest rate | 5.40% | 5.40% |  | 5.40% | 5.40% |  |
Weighted average | Non-recourse |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Interest rate | 4.10% | 4.10% |  | 4.30% | 4.30% |  |
Weighted average | Other |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |  |
Interest rate | 7.10% | 7.10% |  | 7.10% | 7.10% |  |

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